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OBSID:
24911
 Title:
Resolving the Flaring Site of PKS 1127-145 jet      
Investigator:
Siemiginowska
 Observer:
Siemiginowska, Aneta
 Phone:
6174957243
 Email:
asiemiginowska@cfa.harvard.edu
Target Name:
PKS 1127-14
 Sequence Number:
704287
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_008FCB
 Raster Scan:
N
 Annotated DOT:
DEC2820a

Proposal Number:
21708761
 Right Ascension:
172.529
 Declination:
-14.8243
 Status:
archived
 Start Date:
2021-01-01 19:17:16
Category:
ACTIVE GALAXIES AND QUASARS
 Type:
DDT
 AO Cycle:
21
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.51
 Order-1 Count Rate:

 Exposure Time:
15
 Time Remaining:
15.069
 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
On-Chip Summing?:
No
 Row Sum:

 Column Sum:

 Frame Time:
Subarray Mode:
CUSTOM
 Starting Row:
449
 Row Count:
128
 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:
On December 11, 2020 the Fermi-LAT Collaboration reported a strong gamma-ray flare associated with the flat spectrum radio loud quasar PKS 1127-145 at redshift z=1.184. This is the first strong gamma-ray flaring activity observed from this source in the Fermi era with the highest gamma-ray flux ever detected in this quasar, a factor of 50 higher than the average flux estimated in the 4FGL catalogue. This is the first opportunity for Chandra to observe this quasar in an active state. The Chandra observation will provide the required arcsec resolution to confirm that the gamma-ray flare is associated with this quasar and to locate the site of the flare.

psci Run:
30
 Processing Date:
Feb 5 2021
 psci Directory:
/nfs/maaxnew/r3/eZ/acis114a/acis114.log
OBSID:
24911
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
704287
 Target Name:
PKS_1127-14
 AO:
21
Start VCDU:
58178:088
 Start Time (UTC):
001:70400.317
 Stop Time (UTC):
001:85471.430
 Kilosecs:
15.1
 % Frames:
100.0
 # CCDs:
S1
# Frames:
34172
 # Events:
26649
 Events/sec:
1
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-114.2
Parameter Block:
0x008fc014
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 BEP Mode:
F
 Start Row:
448
 # Rows:
128
Primary Exposure:
4
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
30

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