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OBSID:
26508
 Title:
X-rays from highly variable Galactic radio sources: A new population of black hole X-ray binaries
Investigator:
Atri
 Observer:
Atri, Pikky
 Phone:
+31682536836
 Email:
pikkyatri23@gmail.com
Target Name:
[BHW2010] G32.5898-0.4468
 Sequence Number:
402366
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_00A20B
 Raster Scan:
N
 Annotated DOT:
APR1023a

Proposal Number:
24400065
 Right Ascension:
283.101
 Declination:
-0.508212
 Status:
archived
 Start Date:
2023-04-15 21:10:15
Category:
BH AND NS BINARIES
 Type:
GO
 AO Cycle:
24
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.0005
 Order-1 Count Rate:

 Exposure Time:
15
 Time Remaining:
15.070
 Reqd Start Time:

 Reqd Stop Time:
Period:

 Epoch:

 Start of Period:

 End of Period:

 PS Margin:

 PE Margin:

 Max Segments:
0

ACIS Mode:
TE
 Standard?:
No
 BEP Mode:
F
 Dropped Chip Count:
0
 Optional Chips:
I3 S4
On-Chip Summing?:
No
 Row Sum:

 Column Sum:

 Frame Time:
Subarray Mode:
NONE
 Starting Row:
0
 Row Count:
1023
 Subarray Frame Time:

Duty Cycle?:
No
 Cycle Count:
0
 Primary Exp Time:

 Secondary Exp Time:
Event Filter?:
No
 Filter Threshold:

 Filter Range:

 Bias Requested?:
No
 Bias Frequency:

 Bias After?:
No
 Spatial Window?:
No

Abstract:
The variable radio sky is full of exotic transients, and recent sensitive radio surveys are pushing the boundaries of our knowledge by discovering new classes of sources. While hunting for quiescent black hole X-ray binaries (accreting binary systems with very little matter from a stellar-fed accretion disk falling onto a stellar-mass black hole), a Very Long Baseline Array campaign identified four flat-spectrum radio-bright Galactic candidates that (surprisingly) have no known multiwavelength counterparts. Here, we request 15ks of Chandra time on each of these four Galactic targets to obtain the deep, high angular resolution X-ray data needed to constrain the X-ray flux of each unknown source (a crucial metric needed for decoding the nature of these unknown transients).

psci Run:
41
 Processing Date:
Apr 29 2023
 psci Directory:
/nfs/maaxnew/r3/fj/acis124a/acis124.log
OBSID:
26508
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
402366
 Target Name:
[BHW2010]_G32.5
 AO:
24
Start VCDU:
21033:120
 Start Time (UTC):
105:77259.151
 Stop Time (UTC):
106:05942.373
 Kilosecs:
15.1
 % Frames:
100.0
 # CCDs:
I4
# Frames:
4802
 # Events:
359417
 Events/sec:
23
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-111.3
Parameter Block:
0x00a20024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
31
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
41

pgf@space.mit.edu Thu Apr 3 20:00:53 EST 2025